CN105182300B - The land clutter interference real-time suppression method of space-based external illuminators-based radar - Google Patents
The land clutter interference real-time suppression method of space-based external illuminators-based radar Download PDFInfo
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- CN105182300B CN105182300B CN201510578527.7A CN201510578527A CN105182300B CN 105182300 B CN105182300 B CN 105182300B CN 201510578527 A CN201510578527 A CN 201510578527A CN 105182300 B CN105182300 B CN 105182300B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/36—Means for anti-jamming, e.g. ECCM, i.e. electronic counter-counter measures
Abstract
A kind of land clutter the present invention relates to space-based external illuminators-based radar interferes real-time suppression method, wherein according to the transmitting-receiving timing requirements to system radio frequency signal, completes the key parameter design of space-based external radiation source radar system；Spatial position and the movement relation of space based radar platform and external sort algorithm are analyzed, establishes space-based external illuminators-based radar land clutter mathematical model；Reference signal is constructed using direct-path signal, cross correlation process is carried out with the echo signal that binary channels echo antenna receives；The correlated results of the n-th 1 frame signal of the correlated results and two channels of one channel n-th frame signal eliminates land clutter interference using two-pulse canceler；It repeats cross correlation process and dipulse to offset step treated that N frame signals make Fourier transformation along speed dimension realizes correlative accumulation by clutter recognition, target detection is realized using constant false alarm criterion.The present invention preferably can inhibit land clutter to interfere, while reduce algorithm complexity, be easy to implement the real time data processing of space-based platform.
Description
Technical field
A kind of land clutter the present invention relates to space-based external illuminators-based radar interferes real-time suppression method, belongs at radar signal
Manage technical field.
Background technology
Space-based external illuminators-based radar is a bistatic or multi-static radar system, itself does not use transmitter, but
By the use of navigation, telecommunication satellite signal as external sort algorithm, and by radar receiver mounted on aircraft, unmanned plane, dirigible, balloon,
On the broad sense space-based platform such as satellite, the disturbance realization target acquisition for receiving aerial target to external sort algorithm electromagnetic field is detectd, such as Fig. 1 institutes
Show.
In space-based external illuminators-based radar signal processing flow, ground bounce removal is the Major Difficulties of systems face.Tradition
The clutter spectrum of ground-based radar is mainly distributed near zero Doppler frequency in a relatively narrow frequency band, and clutter recognition is relatively easy,
And the clutter environment of space-based external illuminators-based radar is increasingly complex, the displacement of platform and external sort algorithm causes land clutter distribution tool
Two dimensional Distribution characteristic at one's leisure.On the one hand, since the radial velocity component of platform movement causes the Doppler of ground-clutter spectrum entirety
Frequency displacement；On the other hand, each clutter unit is due to the inconsistent inconsistency for causing Doppler frequency shift in opposed platforms orientation, and then
The dopplerbroadening that main-lobe clutter is caused to compose.
Entitled " the external illuminators-based radar sea clutter disturbance restraining method based on multichannel NLMS " application No. is
In 201310752143.3 invention and entitled " the external illuminators-based radar sea clutter AF panel side based on multichannel RLS
In the invention of method " application number 201410161408.7, mainly for the clutter recognition of ground external radiation source radar system, and algorithm
Complexity is high, and convergence time is long, needs to carry out offline Non real-time processing using computer.
Entitled " realizing external illuminators-based radar multichannel time domain clutter recognition using GPU " application No. is
In 201410428377.7 method, in entitled " the FPGA realization equipment and side that external illuminators-based radar self-adapting clutter inhibits
In the invention of method " application number 201310331240.5 and entitled " a kind of external illuminators-based radar direct wave based on GPU is miscellaneous
Wave offsets real-time processing method " it is various using GPU, FPGA etc. application No. is description in 201310099540.5 invention, is focused on
Hardware platform realizes clutter suppression method.
Invention content
During the purpose of the present invention is being directed to space-based external illuminators-based radar detection sea and aerial moving-target, tradition is adaptive when empty
It answers filtering algorithm complexity height, convergence time length, the problem of real-time processing requirement can not be met, propose a kind of space-based external sort algorithm
The land clutter disturbance restraining method of radar, preferably can inhibit land clutter to interfere, while reduce algorithm complexity, be easy to implement day
The real time data processing of based platform.
In order to achieve the above object, it is done the technical scheme is that providing a kind of land clutter of space-based external illuminators-based radar
Disturb real-time suppression method；
Wherein, space-based external sort algorithm uses geostationary orbit satellite constellation, and radar receiver is mounted on the low rail of movement
On satellite platform, while receive direct-path signal and echo-signal；
It is required that axial alignment of each channel of aerial array along flight, and on each pulse recurrence interval, make latter passage
Phase center overlapped with the phase centre location of previous channel；
Will using direct-path signal construction reference signal, the echo signal received with binary channels echo antenna respectively into
Row cross correlation process；
The correlated results of one channel n-th frame signal and the correlated results of two the (n-1)th frame signals of channel are used into dual-pulse
Device disappear to eliminate land clutter interference；
Repeat the step of cross correlation process to dipulse offsets, by land clutter interference treated N frame signals along speed
Degree dimension makees Fourier transformation and realizes correlative accumulation, and target detection is realized using constant false alarm criterion；
Complete the processing of space-based external illuminators-based radar land clutter AF panel.
The present invention has the following advantages that compared with background technology：
Research object and clutter suppression method of the invention with first two existing patent of invention technologies is different from, the present invention
For the special spatial topotaxy of space-based external radiation source radar system, corresponding land clutter mathematical model is derived, and propose
The clutter suppression method that a kind of suitable space-based platform is handled in real time.
The multi-channel adaptive wave filter that the present invention iterates without construction, system structure is simple and reliable, Project Realization
Property is good；It is of the invention suitable to the inhibition of land clutter with existing patent, and algorithm complexity is lower, and there is no prolonged
Iteration convergence problem adapts to the real-time processing requirement of space-based platform.
Description of the drawings
Fig. 1 is space-based external sort algorithm operation principle schematic diagram；
Fig. 2 a, Fig. 2 b are space-based external illuminators-based radar land clutter mathematical model；
Fig. 3 is space-based external illuminators-based radar ground-clutter spectrum distribution schematic diagram；
Fig. 4 is noise jamming real-time suppression method fundamental diagram；
Fig. 5 is noise jamming real-time suppression method signal processing flow figure；
Fig. 6 a, Fig. 6 b are the simulation model and simulation result of noise jamming real-time suppression method algorithm simulating.
Specific embodiment
Fig. 1 is space-based external sort algorithm operation principle schematic diagram, and system uses bistatic or multistatic radar framework, outside space-based
Radiation source generally use geostationary orbit (GEO) satellite constellation, and radar receiver is mounted on low orbit satellite platform, simultaneously
Direct-path signal and echo-signal are received, wherein echo-signal may be from ground static target, ground moving target and move in the air
Target.In typical target acquisition application, aerial moving-target and ground moving target are that user is interested, and ground static mesh
Target echo then becomes the noise signal for influencing moving-target detection, needs to realize dynamic mesh by certain Clutter suppression algorithm processing
Target detects.
With reference to Fig. 4 and Fig. 5, clutter spectrum widening caused by the present invention is moved for radar platform realizes space-based external sort algorithm
The real-time inhibition of Radar Ground Clutter interference.Wherein, Fig. 4 is noise jamming real-time suppression method fundamental diagram, it is desirable that antenna array
Axial alignment of each channel along flight is arranged, and on each pulse recurrence interval, the phase center of latter passage is made to lead to previous
The phase centre location in road overlaps.First by previous channel emission and the one or two pulse is received, when latter passage arrival is previous
During the position of channel emission pulse, emit next pulse.Therefore, former and later two pulses are skyborne same point transmittings and connect
It receives, this, which is equivalent to two pulses, is by a static antenna transmitting and receives, and can thus compensate and be put down by radar
Clutter spectrum widening caused by platform moves.
Fig. 5 is noise jamming real-time suppression method signal processing flow figure, and echo-signal and direct-path signal pass through low noise
After sound amplification, mixing down coversion and A/D acquisition process, binary channels echo-signal makees cross correlation process with direct-path signal respectively,
By treated, two paths of signals subtracts each other, and the signal after then binary channels is offseted does Fourier's variation along each range cell,
It is formed apart from Speed Two Dimensions plane, finally realizes target detection according to constant false alarm criterion.
The present invention passes through rational parameter in the processing procedure for carrying out space-based external illuminators-based radar land clutter AF panel
Design completes clutter cancellation to the binary channels echo-signal after relevant treatment in time domain, and retains moving-target information, by away from
From Speed Two Dimensions processing and CFAR detection processing mode, moving-target detection is realized.
The land clutter interference real-time suppression method of the present invention, specifically includes following steps：
1. according to noise jamming real-time suppression method to the timing requirements of data acquisition and processing (DAP), to space-based external sort algorithm thunder
Key parameter up to system is designed as follows：
Assuming that space-based external sort algorithm orbit altitude 36,000km, carrier frequency 1.5GHz, operation wavelength λ=0.2m, signal
Bandwidth B=200Hz.
Satellite platform orbit altitude 500km, platform speed v=7.5km/s, binary channels echo antenna where radar receiver
Interval D=0.1m, and along the axial alignment of flight, for ensure on each pulse recurrence interval the phase center of latter passage with
The phase centre location of previous channel overlaps, the repetition rate f of system acquisition direct wave and echo-signalr=v/D, takes 75kHz.
Data sampling rate fr=1MHz, integration time τ=1s.
2. the space-based external illuminators-based radar land clutter mathematical model shown in a according to fig. 2, target B is located at radiation source S and thunder
On the ellipsoid formed up to the equidistant deviation of dual station that A is focus, it is similarly positioned on the ellipsoid that land clutter scattering point P will be to corresponding
Target detection in range cell generates interference.Phase is kept since space-based external sort algorithm is apart from ground 36,000km, and with ground
To static as, therefore the land clutter signal in range cell where target can be regarded to a large amount of points of ellipsoid and horizontal plane intersection
The scatter echo set of target.In addition, the radar receiver antenna on satellite platform uses side view battle array, and antenna as shown in Figure 2 b
Array element is parallel to the satellite platform direction of motion.
Then, the land clutter Doppler frequency of scattering point P generations is
In formula, v is platform speed, and λ is operation wavelength,For azimuth, θ is pitch angle, and α is space cone angle.
According to the mathematical model shown in formula (1) and Fig. 2 a, Fig. 2 b, the ground-clutter spectrum point of space-based external illuminators-based radar can be obtained
Cloth, as shown in Figure 3：
Radar is located at the center of figure, and arrow show the radar platform direction of motion.Ground-clutter spectrum wait Doppler's line be with
Radar is set to center in place, and relative to the symmetrical hyperbola in radar motion course line, different gray scales wait Doppler's line to represent tool
The Doppler frequency value of body, unit are hertz；Line of equidistance is several concentric circles for being set to the center of circle in place with radar, is called
Equidistant circle, the different radii of equidistant circle represent different dual station relative distance values.
Since the satellite platform speed where radar receiver is up to 7.5km/s, resulting land clutter Doppler exhibition
Wide scope is much larger than ground external radiation source radar system, will flood the echo-signal of air-sea moving-target, and same distance completely
Ground-clutter spectrum in unit exists with orientation to be coupled strongly, can not inhibit ground by traditional one-dimensional time domain or frequency domain filtering technology
Clutter.
3. assume that the radiofrequency signal of external sort algorithm transmitting is expressed as
xT(t)=XT(t)exp(j2ft) (2)
In formula f be carrier frequency, XT(t) it is complex baseband signal.
After then target echo signal is down-converted to base band, it is represented by
In formula, r (t) is the dual station distance of target, and A is the complex amplitude of target echo, and c is constant.
The reference signal of echo-signal and through wave structure is carried out computing cross-correlation by external illuminators-based radar, is shown below
4. binary channels echo-signal, after cross correlation process, the correlated results of 1 channel n-th frame signal is Y1, n(r, v), 2
The correlated results of the (n-1)th frame signal of channel is Y2, n-1(r, v) completes dipulse in time domain and offsets
YD(r, v)=Y1, n(r, v)-Y2, n-1(r, v) (5)
5. step 3,4 are repeated, by clutter recognition treated N frames YD(r, v) signal makees N point Fourier transformations along speed dimension
It realizes correlative accumulation, moving-target detection can be realized using constant false alarm criterion, the simulation model and simulation result of handling result are such as
Shown in Fig. 6.
Wherein, Fig. 6 a assume that one group of static target and 4 moving-targets are distributed on an ellipse, radiation source and space based radar
Distribution is located at elliptical two focuses so that land clutter and target echo are in the same range cell of radar receiver.By
Fig. 6 b are it is found that this method can make land clutter average attenuation 30dB or so, the inhibition with space-time two-dimensional adaptive filter method
Quite.
So far, the processing of space-based external illuminators-based radar land clutter AF panel is completed.
Although present disclosure is discussed in detail by above preferred embodiment, but it should be appreciated that above-mentioned
Description is not considered as limitation of the present invention.After those skilled in the art have read the above, for the present invention's
A variety of modifications and substitutions all will be apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (2)
1. a kind of land clutter interference real-time suppression method of space-based external illuminators-based radar, it is characterised in that：
Space-based external sort algorithm uses geostationary orbit satellite constellation, and radar receiver is mounted on the low orbit satellite platform of movement
On, while receive direct-path signal and echo-signal；
It is required that axial alignment of each channel of aerial array along flight, and on each pulse recurrence interval, make the phase of latter passage
Position center is overlapped with the phase centre location of previous channel；
By using the reference signal of direct-path signal construction, the echo signal received with binary channels echo antenna carries out mutually respectively
Relevant treatment；
The correlated results of one channel n-th frame signal and the correlated results of two the (n-1)th frame signals of channel are used into two-pulse canceler
To eliminate land clutter interference；
Repeat the step of cross correlation process to dipulse offsets, treated that N frame signals are tieed up along speed by land clutter interference
Make Fourier transformation and realize correlative accumulation, target detection is realized using constant false alarm criterion；
Complete the processing of space-based external illuminators-based radar land clutter AF panel；
Wherein, to ensure that the phase center of latter passage is overlapped with the phase centre location of previous channel, basis is further included
To the transmitting-receiving timing requirements of system radio frequency signal, the process of the key parameter design of space-based external radiation source radar system is completed；
The key parameter, comprising：Space-based external sort algorithm orbit altitude, carrier frequency, operation wavelength λ, signal bandwidth B；Radar
Satellite platform orbit altitude where receiver, platform speed v, binary channels echo antenna spacing D acquire direct-path signal and echo
The repetition rate f of signalr=v/D, data sampling rate fr, integration time；
And before cross correlation process, spatial position and movement relation comprising analysis satellite platform and external sort algorithm establish day
The following process of base external illuminators-based radar land clutter mathematical model：
Target is located on the ellipsoid formed using external sort algorithm and radar as the equidistant deviation of the dual station of focus, is similarly positioned in the ellipsoid
Land clutter scattering point P on face will generate interference to the target detection in respective distance unit；
Then, opposing stationary relationship is kept according to space-based external sort algorithm orbit altitude and its with ground, by distance list where target
Land clutter signal in member regards ellipsoid and the scatter echo set of a large amount of point targets of horizontal plane intersection as；To satellite platform
On radar receiver antenna using side view battle array, and bay is made to be parallel to the satellite platform direction of motion；
Scattering point P generate land clutter Doppler frequency be
In formula,For azimuth, θ is pitch angle, and α is space cone angle；
The Doppler's line that waits of ground-clutter spectrum is the center that is set in place with radar, relative to the symmetrical hyperbolic in radar motion course line
Line.
2. land clutter as described in claim 1 interferes real-time suppression method, which is characterized in that
The radiofrequency signal of external sort algorithm transmitting is expressed as
xT(t)=XT(t)exp(j2ft)
In formula, f is carrier frequency, XT(t) it is complex baseband signal；
Target echo signal is expressed as after being down-converted to base band
In formula, r (t) is the dual station distance of target, and A is the complex amplitude of target echo, and c is constant；
The reference signal of echo-signal and direct-path signal construction is carried out computing cross-correlation by external illuminators-based radar：
In formula, Δ T be integration time, platform speed v,
It is the radiofrequency signal x using transmittingT(t) it constructs
Reference signal, and xT(t) reference signal received by the wave antenna that goes directly obtains；Wherein r values are dual station distance r (t)；
For binary channels echo-signal after cross correlation process, the correlated results of a channel n-th frame signal is Y1,n(r, v), two channels
The correlated results of (n-1)th frame signal is Y2,n-1(r, v) completes dipulse in time domain and offsets：
YD(r, v)=Y1,n(r,v)-Y2,n-1(r,v)。
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| CN106405515B (en) * | 2016-08-23 | 2018-12-21 | 西安空间无线电技术研究所 | A kind of space based radar Clutter simulation method |
| CN106802409B (en) * | 2017-01-19 | 2019-08-16 | 电子信息系统复杂电磁环境效应国家重点实验室 | External illuminators-based radar real-time signal-processing method based on multi -CPU processing |
| KR102571048B1 (en) * | 2017-12-19 | 2023-08-24 | 스마트스카이 네트웍스 엘엘씨 | Interference mitigation based on antenna system phase distribution |
| CN109358324B (en) * | 2018-10-31 | 2020-07-14 | 安徽四创电子股份有限公司 | Target detection method based on ground monitoring radar spectrum data |
| CN110212971B (en) * | 2019-06-17 | 2020-06-02 | 航天科工空间工程发展有限公司 | Method for acquiring frequency interference of low-orbit constellation system to geostationary orbit satellite system |
| CN111273251B (en) * | 2020-03-09 | 2022-07-22 | 上海无线电设备研究所 | Multi-core DSP-based particle swarm exchange long-time accumulation implementation method |
| CN111624556A (en) * | 2020-06-08 | 2020-09-04 | 河海大学 | Meteorological radar WTC (wind turbine controller) inhibition method based on morphological component analysis |
| RU2751999C1 (en) * | 2020-08-24 | 2021-07-21 | Акционерное общество "Научно-исследовательский институт современных телекоммуникационных технологий" | Method for semiactive-passive bistatic determination of location of target |
| CN113589251B (en) * | 2021-07-29 | 2024-01-05 | 上海无线电设备研究所 | Unit average constant false alarm detection method after Mean-Shift echo clustering |
| CN113640888B (en) * | 2021-09-24 | 2022-10-14 | 山东大学 | External noise suppression method and system based on frequency domain cross-correlation of transmitted and received signals |
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